add middleware

http-api/middlewares/authorizer_middleware.py

@@ -0,0 +1,48 @@
+from aws_lambda_powertools.event_handler.api_gateway import (
+    APIGatewayHttpResolver,
+    Response,
+)
+from aws_lambda_powertools.event_handler.middlewares import (
+    BaseMiddlewareHandler,
+    NextMiddleware,
+)
+from pydantic import UUID4, BaseModel, EmailStr, Field
+
+from auth import AuthFlowType
+
+
+class User(BaseModel):
+    id: str
+    name: str
+    email: EmailStr
+
+
+class CognitoUser(User):
+    id: str = Field(alias='custom:user_id')
+    email_verified: bool
+    sub: UUID4
+
+
+class AuthorizerMiddleware(BaseMiddlewareHandler):
+    def handler(
+        self,
+        app: APIGatewayHttpResolver,
+        next_middleware: NextMiddleware,
+    ) -> Response:
+        # Gets the Lambda authorizer associated with the current API Gateway event.
+        # You can check the file `auth.py` for more details.
+        context = app.current_event.request_context.authorizer.get_lambda
+        auth_flow_type = context.get('auth_flow_type')
+
+        if not auth_flow_type:
+            return next_middleware(app)
+
+        cls = {
+            AuthFlowType.USER_AUTH: CognitoUser,
+            AuthFlowType.API_AUTH: User,
+        }.get(auth_flow_type)
+
+        if cls:
+            app.append_context(user=cls(**context['user']))
+
+        return next_middleware(app)